Bug ID 523451: Benign virtio I/O errors when run on pre 11.5 hosts

Last Modified: Oct 17, 2023

Affected Product(s):
BIG-IP vCMP(all modules)

Known Affected Versions:
12.0.0, 12.0.0 HF1, 12.1.0 HF1, 12.0.0 HF2, 12.1.0 HF2, 12.0.0 HF3, 12.0.0 HF4, 12.1.1 HF1, 12.1.1 HF2, 12.1.2 HF1, 12.1.2 HF2

Opened: May 14, 2015

Severity: 5-Cosmetic


When running version 12.0.0 on vCMP host versions previous to 11.5.0, the system produces a series of benign errors in /var/run/vcmpd/guestname/qemu.pid similar to the following messages: block I/O error in device 'virtio0': Input/output error (5).


Cosmetic: a small number of benign virtio0: Input/output errors appear in the guest's logs on the host. These errors are cosmetic and are a known and benign issue related to the version of qemu and how it handles newer linux kernels.


Running BIG-IP software version 12.0.0 configured for vCMP on hosts with versions earlier than 11.5.0.


None needed. These are cosmetic errors that have no impact on system functionality.

Fix Information


Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips